ag_toolsbox/hash/crc16/crc16.go

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// 提供CRC16校验和计算功能。
package crc16
import (
"encoding/hex"
"fmt"
"io"
"os"
"github.com/howeyc/crc16"
)
// 根据给定的校验表类型生成对应的校验器
func hasherSelect(table string) crc16.Hash16 {
switch table {
case "CCITT":
return crc16.NewCCITT()
case "CCITT-FALSE":
return crc16.New(crc16.MakeTable(crc16.CCITTFalse))
case "SCSI":
return crc16.NewSCSI()
case "IBM":
return crc16.NewIBM()
case "MBUS":
return crc16.New(crc16.MakeTable(crc16.MBUS))
default:
return crc16.NewIBM()
}
}
// 计算给定字节数组的CRC16校验和返回字节数组
func CRC16(data []byte, table ...string) []byte {
crcTable := append(table, "IBM")
hasher := hasherSelect(crcTable[0])
hasher.Write(data)
return hasher.Sum(nil)
}
// 计算给定字节数组的CRC16校验和返回十六进制字符串
func CRC16Hex(data []byte, table ...string) string {
return hex.EncodeToString(CRC16(data, table...))
}
// 计算指定文件的CRC16校验和返回字节数组
func SumFile(file string, table ...string) ([]byte, error) {
f, err := os.Open(file)
if err != nil {
return nil, fmt.Errorf("未能打开指定文件,%w", err)
}
defer f.Close()
crcTable := append(table, "IBM")
hasher := hasherSelect(crcTable[0])
if _, err := io.Copy(hasher, f); err != nil {
return nil, fmt.Errorf("未能读取指定文件的内容,%w", err)
}
return hasher.Sum(nil), nil
}
// 计算指定文件的CRC16校验和返回十六进制字符串
func SumFileHex(file string, table ...string) (string, error) {
hash, err := SumFile(file, table...)
if err != nil {
return "", err
}
return hex.EncodeToString(hash), nil
}